Fūinjutsu, the art of sealing, is considered to be the toughest and most dangerous ninja art known to man. Most people find the art too hard to learn, but some that do give it an effort have been able to become some of the most dangerous ninja known.

Uzumaki clan stands as an example for such people who devoted themselves to this art. Eventually though, their sealing techniques became so feared various nations began allying together in order to get rid of such major threat.

While the Uzumaki fought briefly, they were but one clan with limited resources when compared to combined forces of multiple nations. Eventually, the Uzumaki clan was reduced to a few members, and most of the secrets of Fūinjutsu were lost.

Description: After performing the hand seals (or rather, chant them out like an incantation), the user releases a dark shock wave that destroys the talismans on the Shrine Seal, and shatters the stone door, releasing Mōryō's entrapped soul. This may be a variation of the Shrine Seal, or even the counterpart, as it contains a portion of the hand seals that the sealing technique does.

Description: By placing a mark on a person in a ritualistic method, this technique will activate as timed even if the person is tortured or put under a trance. This is meant to catch an enemy when their guard is down. Sai mentions that this is used as a last resort technique by the ANBU, and as such, is rare. When Kakashi Hatake requested Tsunade to use it on him, the technique would activate Kakashi's Mangekyō Sharingan technique, the Kamui, upon Hiruko's attempt to assimilate him.

Description: The user concentrates chakra into their finger and using the heat from that can apply writing on whatever they want. This allows them to write on the skin of animals, iron plates, or a wide range of things however when doing so requires them to be very delicate with their chakra control. This jutsu causes slight discomfort for a living target and if it is on flesh, it will scar.

Description: This technique creates a barrier around a place by placing four "Forbidden" (禁, kin) tags in different locations surrounding, a fifth tag on the location to be protected. The tags are placed on flat surfaces, and are connected with the user's chakra. This technique turns the entire range surrounded by the tags into a barrier space, and inside the space, the material destruction is "forbidden". Using any kind of physical attack to try and destroy something in the barrier is folly, as it will only lead to injury. To cancel this, it is necessary to search for the five tags and tear them off simultaneously. Meaning there must be at least five people on a team to cancel it.Even if the barrier is broken, there is a final obstacle. The user can add a trap that will create perfect copies of those who have removed the seal, preventing them from returning immediately.

Description: A seal placed on the Fire Temple's gate, in order to defend against intruders from the outside world. The two statues placed on either side of the gate form a barrier. The seal can only be canceled by pouring in the Gift of the Hermit Group, special chakra peculiar to the ninja monks of the Fire Temple. However, as shown when Kakuzu used his Earth Release: Earth Spear to strike the gate, a powerful enough physical attack can destroy the seal.

Description: The user along with their two shadow clones creates a triangle seal around the opponent, making seals and trapping the opponent in said triangle. Then a tetrahedral form of light traps and explodes from within, leaving a big hole in the ground. Everything within the barrier suffers the same damage as a point blank range explosive tag.

Description: With the aid of a tag, the user creates a seal which affects a certain area around it removing the soul of the opponents from their bodies. The souls are then sealed within the tag. If someone comes in contact with the tag or removes it from its place, the souls will be released, appearing in a short time near the one who touched the tag as ghosts, only visible and audible by that person, and with no memories of their past life.

Description: This seal is used in conjunction with the Four Black Fog Battle Formation. After the Sound Four seal the individual in the container, this seal is added as another layer of protection. To create the seal, Sakon writes the incantation in blood on the sealing paper and then attaches it to the container before activating it with a hand seal.

Description: This jutsu allows the user to seal fire into a scroll. The user writes the seal on a scroll and then performs the required hand seals. This causes a vapor to appear from the scroll, enveloping the fire and sealing it on the scroll as the kanji for seal (封). Jiraiya used this jutsu to seal away the black fire from Itachi Uchiha's Amaterasu technique.

Description: A barrier ninjutsu technique performed by all of the Sound Four, used during the temporary "death" of those advancing their cursed seal to its second level. The seal confines them in a coffin while the process takes place, and does not even allow the Byakugan to see inside. The Dark Sealing Method can be used for an additional layer of protection. The seal seems to be naturally lifted once level two had been attained.

Description: This technique is a performance by puppets #4, #6, #8 from the Chikamatsu Collection. The three puppets get into a triangular formation and by opening the mechanisms marked with "Buddha," "Dharma," and "Sangha," respectively, they invoke this technique. A terrifying tornado breaks out and sucks the targets into the center of the formation. Everything that is sucked into the center is completely crushed with tremendous force and shot out from the back. However, the vacuum can be overloaded, leaving the three puppets vulnerable.

Description: This sealing technique completely blocks the target's chakra with a sealing formula (封印式, fūin-shiki) drawn on the ground or a wall. This is done by closing all the tenketsu of the person caught in the middle. Signifying this is the stylised kanji for "close," or "shut" (閉, hei) drawn in the middle of the sealing formula. To successfully seal the target, one has to get them exactly inside the sealing formula. This requires great accuracy and is very difficult. Various methods can be used to make this easier. For instance, one can prepare a puppet or a ninja tool like the Lion-Headed Kannon with this sealing formula.

Description: This seal is in the Land of Swamps, and contains the body of the evil spirit Mōryō.The technique is composed of several stages. The first three seals will light the seal up, allow the user to levitate, and create a barrier. The barrier will repel things from the outside, although Mōryō managed to enter at the cost of the life of his host, Yomi. Also, the spheres inside the circle will begin to revolve around the circle.The next nine seals will cause the gate-like seal leading to Mōryō's body to rise above the ground. This gate seems to be laid on its back.The final six seals will release the seal on Mōryō's body, and it becomes accesible (to Mōryō). After reclaiming his body, Mōryō managed to break the barrier around the seal, as he mentions Yomi did not have the ability to do so.The true effect of the sealing is that the user and the target being sealed will merge into one being. So that neither parties can utilize their abilities, the two minds are combined into one. Then one must absorb the other (which is decided by their chakra), as Mōryō did with Miroku (this gave to the rise of Mōryō in the first place, who was born from the darkness inside the hearts of people), and neither the user nor target can leave the shrine until this happens. Mōryō could not do the same with Shion due to the bell which contained the stone where Miroku sealed all of her powers into.Shion, however, knew nothing about this, instead believing the sealing technique will simply seal the demon away

Description: When the user implements this fūinjutsu on a summoner, it removes any control the summoner has over their summoned creature. This does not mean that the user of this technique gains control over the summoned creature. Close contact and the summoner's blood appears to be required for the implementation of the seal. Minato used this technique to wrest the Nine-Tailed Demon Fox from Madara's control.

Description: This is a technique that seals the technique Amaterasu within the Sharingan of another person. After being sealed within the person it is involuntarily activated (indicated by the person's Sharingan taking the form of the sealer's Mangekyō Sharingan) when the eye sees its target, which is predetermined by the user.

Description: This jutsu is used to suppress jutsu-induced marks on a person. Marks of weaker power can be completely suppressed by this jutsu alone, but for marks of higher power like Sasuke Uchiha's Cursed Seal of Heaven, this seal is dependent on the recipient's willpower to some extent. It is also capable of holding back certain Kekkei Genkai, such as that of the Kurama clan as seen when Kurenai tried to do this. This seal requires a number of hand seals and a large amount of chakra to be performed. Preparation for this jutsu requires two concentric circles with kunai placed in intervals along the circumference, in addition to a number of characters written in blood that radiate out from the center of the curse seal. According to Kakashi, this jutsu is quick, but painful. The seal can be removed at any time by the caster or whoever the seal is on, as demonstrated during Sasuke's battle with Naruto in the Valley of the End. Since this seal does rely on the will of the individual on to whom its placed the affected may be able to just will it away without an unsealing jutsu. When Orochimaru was extracted from Sasuke through Itachi's Sword of Totsuka, not only was the Cursed Seal of Heaven removed, but also the Evil Sealing Method around it.

Description: This jutsu produces a powerful seal that is used to block or disturb the flow of chakra in a target. Once the seal is completed, the target will become unconscious and unable to fight for a short time. Orochimaru performed this jutsu to tamper with the seal on the Nine-Tailed Demon Fox. The original seal allowed the Nine-Tails' chakra to seep out into Naruto Uzumaki, but the additional seal disturbs this, preventing Naruto from using the Nine-Tails' chakra or even controlling his own chakra properly. This is because an odd-numbered seal creates an imbalance when placed on top of an even-numbered seal. When Orochimaru later notices that the seal has been removed, he remarks that there are very few ninja capable of doing so.

Description: This technique is a fuinjutsu that the user places across their chest, and sets it to activate upon their death. The technique releases four symbols from the user's body that then form a large, black sphere around them. Anything caught inside the sphere's area is then drawn in and sealed within the user's corpse. This technique has the opposite effect of the Four Symbols Seal, a technique which allows Naruto to draw out the Nine-Tailed Demon Fox's chakra from within himself.

Description: This technique was designed by Tsunade for the purpose of sealing a tailed beast. The technique is performed with four separate scrolls and a sample of blood similar to a Summoning Technique. Shizune mentioned that good chakra control and concentration are needed to perform the sealing technique. To use this technique, a scroll is needed to seal the numerous amounts of chakra. This technique was supposed to seal the Three-Tailed Giant Turtle in its own dimension, permanently. This jutsu has three stages: a "Search" stage, a "Bind" stage, and a "Lock" stage in capturing the target.

Description: The Eight Trigrams Sealing Style, consisting of two Four Symbols Seals, was used by Minato Namikaze to help Naruto Uzumaki access the chakra of the Nine-Tailed Demon Fox sealed within him. To perform the technique, the user must first summon a ceremonial throne, and place the target on it.He claimed it was designed to hold an imprint of this seal's user (as well as the chakra and personalities of other people that the sealer chooses) as a failsafe. These imprints (as in the case of Minato and Kushina Uzumaki) have the capacity to recede the Nine-Tails' activity and interact with Naruto, talking to him for a limited amount of time. As time passes the seal weakens. As such, to strengthen the seal again when it gets too weak, Minato drew a key on the abdomen of the scroll toad Gerotora. The key can also be used to completely remove the seal. When Orochimaru used the Five Elements Seal on Naruto, this created an imbalance due to an odd-numbered seal being placed over an even-numbered one. As a result, Naruto not only lost access to the Nine-Tails' chakra, but also had difficulty controlling his own, until Jiraiya removed it.

Naruto preparing the key to combat and control the Nine-Tailed Demon Fox.

Description: A highly advanced sealing technique that is capable of absorbing any chakra, regardless of any shape or nature transformation, and dispersing it within one's body by spinning the chakra within one's body in the opposite direction. As a result, this technique can absorb any ninjutsu based technique, regardless of power, without harming the user.Should the user get close enough to grab the opponent, the barrier can absorb chakra right out of an individual's body, effectively draining them (similar to the Chakra Absorption Technique).

Description: Infūin is a powerful sealing technique. Over a period of time, the user will focus and build up chakra in the seal mark on his/her forehead. The release command will disperse the seal and allow the stored chakra to pump back into their body.

Description: The Dead Demon Consuming Seal is a seal which invokes the power of the death god (死神, shinigami). Once called upon, the death god hovers behind the user and wraps its left arm with prayer beads, which causes a seal to appear on it. The soul of the summoner is also seen along with the death god, restrained by its hair but still attached to the user. The death god then inserts its arm into the user's soul. At this stage only the user can see the death god. To perform the seal the user need only grasp the target. The death god's arm extends from their chest and grabs the soul of the target, immobilizing them and allowing them to see the death god as well. The death god then performs the sealing. It is also possible for the user to seal multiple targets through the use of shadow clones. When Hiruzen used it, he had to get close to his targets in order to perform the sealing, a restriction that Minato didn't have, the death god's hand extending from him until it reached the Nine-Tailed Demon Fox.If the user cannot pull out their target's entire soul, he can have the death god use its knife to sever a piece of the soul and seal it. The part sealed will suffer from necrosis, causing extreme pain and leaving the target unable to use the corresponding body part. Orochimaru however, believed the world's greatest medical-nin Tsunade, could heal the damage the seal caused to his arms.Soon after the sealing is completed the death god consumes the souls of the user and the sealed, sentencing them to be locked in combat within its stomach for all eternity. A seal is left on the stomachs of those that have had something sealed within them using this jutsu. There is a limit to how much chakra can be sealed by the Dead Demon Consuming Seal, Minato Namikaze explained how it was physically impossible to seal away all of the Nine-Tails' chakra, opting instead to seal half within the death god along with himself, and the other half in Naruto Uzumaki.

Description: The Sealing Technique: Illusionary Dragon Nine Consuming Seals is a jutsu that was used by Pain and the other members of Akatsuki to forcibly drain the spirit and chakra of the tailed beasts from their still-living jinchūriki, then to seal it in what appeared to be the Demonic Statue of the Outer Path. The jutsu took three full days to complete if nine of the Akatsuki members were present. Kisame Hoshigaki suggested that it "may take longer without Orochimaru". When reduced to three people, Zetsu claimed that, with so few people left to perform the jutsu, it would take a while.To prepare for the jutsu, Pain would summon the sealing statue, after which each member would then stand on one of its fingertips, corresponding to their specific ring finger. When performed, this jutsu caused the bit to fall out of the mouth of the statue. Each of the Akatsuki members would then concentrate, causing the kanji of their rings to appear on the nail of the finger they were standing on. Nine dragon-like effigies then poured from the statue's mouth, surrounded the captured host, and removed the tailed beast from them (the process seems to be quite agonizing to the host). In the case of an unsealed tailed beast, the same thing happened to the beast itself, and still took as much time as if it were sealed. After the process was complete, the beast was sealed within the statue, and one of the statue's nine eyes opened. The host then died due to the removal of their tailed beast. The Nine-Tailed Demon Fox must be sealed last, or the statue would shatter.It seems that the rest of Akatsuki can still perform this jutsu even without Pain being present. However, with Nagato now dead, Madara claimed that they would need a new pawn to synchronize with the Demonic Statue of the Outer Path in order to seal the Eight-Tailed Giant Ox and the Nine-Tailed Demon Fox.This jutsu is mainly used for Madara Uchiha's Eye of the Moon Plan, as well as Nagato's plan to create peace. Madara wants to join all the tailed beasts to bring them back to their original form and make the Ten-Tailed Beast. He would then become its jinchūriki and cast a shadow of the Sharingan on the moon, which he calls the Infinite Tsukuyomi, that shall put all the people in the world in an eternal trance and come under Madara's control. Nagato's plan was to use the tailed beasts to create a jutsu that would cause massive devastation, able to destroy countries themselves. This would create a era of peace, as countries would be afraid to use this power again and cause more war and suffering, before the pain wears off and the jutsu is used again, creating small eras of peace in a cycle of hatred.

Description: This technique is used by Shion. She releases power through her Mystic Safety Bell, and completely transforms. This allows her to send a huge ray of light which can penetrate Mōryō's darkness. In this form, she has the ability to, and attempted to, completely destroy Mōryō along with herself. She was pulled out by Naruto before she could do so.

Description: This is a sealing technique based on the the fūinjutsu of Uzushiogakure. The sealing formula is carved into a human body or an object, and is mainly used when a giant enemy or evil spirit needs to be sealed. To use it, it is necessary for the user to have great ability. This is a high-quality seal and is more durable compared to the Iron Armour Seal that holds the Eight-Tailed Giant Ox. This seal is the opposite of the Reverse Four Symbols Sealing Technique.When two Four Symbols Seals are used together, they form the Eight Trigrams Sealing Style. When Minato sealed the Nine-Tailed Demon Fox into Naruto Uzumaki, he left an opening at the space where the two four symbols seals meet, allowing the Nine-Tails' chakra to merge with Naruto's chakra. Minato also left behind a key with Gerotora, which would be used to tighten the seal when it weakened. Naruto would eventually use the key to gain control over the Nine-Tails' chakra.The seal also usually appears at the stomach of the users of the Dead Demon Consuming Seal after their target (and the user's own soul) is sealed in the death god's stomach, such as what happened to Hiruzen Sarutobi after sealing Orochimaru's arms.